* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Form 3 Biology End Of Term 3 Paper 2
Survey
Document related concepts
Cell culture wikipedia , lookup
Hematopoietic stem cell wikipedia , lookup
Chimera (genetics) wikipedia , lookup
Dictyostelium discoideum wikipedia , lookup
Induced pluripotent stem cell wikipedia , lookup
Cell theory wikipedia , lookup
List of types of proteins wikipedia , lookup
Adoptive cell transfer wikipedia , lookup
Regeneration in humans wikipedia , lookup
Organ-on-a-chip wikipedia , lookup
State switching wikipedia , lookup
Transcript
KERUGOYA BOYS HIGH SCHOOL END OF TERM THREE EXAMS YEAR 2015 FORM THREE BIOLOGY PAPER TWO NAME………………………………………………………. CLASS………………. ADM NO…………….. INSTRUCTIONS TO CANDIDATES a) Write your name and admission number in the spaces provided above b) This paper consists of two sections; A and B c) Answer all the questions in section A. d) In section B answer question 6 (compulsory) and either question 7 and 8 in the spaces provided after question 8 SECTION A 1. a) In the table below, state three differences between the structure of the plant cells and the animal cells. Plant cells Animal cells b) Suppose that each group of cells was placed in a highly concentrated sucrose solution. Describe briefly what would happen in each case. (4 marks) i) Animal cells ii) Plant cells c) Name the carbohydrate in high composition in the chloroplast of a plant cell. (1 mark) 2. a) i) Name the type of germination exhibited in a monocot seedling. (1 mark) ii) Give a reason for your answer in a (i) above. (1 mark) b) State the role of the following during the process of germination. (4 marks) i) Coleoptile ii) Coleorhiza c) Explain the role of oxygen during the germination process. (2 marks) 3. a) Name the class of organism that uses gills for gaseous exchange. (1 mark) b) State the function of gill rakers in the organism in 3(a) above. (1 mark) c) Outline two ways in which gill filaments are modified to perform their functions. (4 marks) d) State the physiological process involved in the movement of oxygen from water into gills. (1 mark) 4. a) Briefly explain how the features of the red blood cell adapt to its function. (3 marks) i) Small size ii) Haemoglobin Lack of nucleus b) State two factors that determine the number of the red blood cells in humans. (2 marks) c) Briefly explain how oxygen is transported from the lungs to the body tissues in humans. (3 marks) 5. The equation below represents a process that takes place in plants 6CO2 + 6H2O C6H12O6 +6O2 a) Name the process (1 mark) b) State two conditions necessary for the process to take place (2 marks) c) State what happens to the end products of the process. (5 marks) SECTION B Answer questions 6 (compulsory) and either question 7 or 8 in the spaces provided after question 8. 6. The table below shows the population of a housefly (Musca domestica) which is parasiticed by wasps of species Nasonia spp. The investigation of their population growth pattern was carried out for 70 weeks. In these experimental space and physical factors were assumed not to be limiting. Time in weeks Musca domestica Nasonia spp 0 5 10 15 20 25 30 35 40 45 40 70 110 260 350 480 400 395 350 40 10 20 30 45 50 55 60 65 70 60 140 250 240 230 100 200 300 380 410 250 60 20 40 200 280 a) Using the same axes, plot graphs of population growth of organisms against time. (8 marks) b) Account for the growth of: i) Musca domestica between 10th week-25th week. (2 marks) ii) Nasonia spp between 40th week-50th week. (2 marks) c) What is the population of: i) Nasonia spp on the 62nd week. (1 mark) ii) Musca domestica on the 4th week (1 mark) d) Bomex , another parasite of housefly was introduced into the ecosystem, what will be the effect on the population of: i) Musca domestica (1 mark) ii) Nasonia spp (1 mark) e) In estimating the population of Musca domestica in the experiment above, capture-recapture method was used. Describe the procedure followed. (4 marks) 7. Describe how fruits and seeds are suited to their modes of dispersal. (20 marks) 8. Describe the role of the liver in homeostasis in the human body. (20 marks)